AutoCodes – Chrysler – B2104 Chrysler

B2104 Chrysler Code - Ignition Unlock Run/Start Control Circuit Low

Quick Answer

The Front Control Module monitors the Ignition Unlock Run/Start Control Circuit. Common causes include Faulty Shifter Lever Assembly, Shifter Lever Assembly harness is open or shorted, Shifter Lever Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B2104 Chrysler indicates Ignition Unlock Run/Start Control Circuit Low.
Common causes: Common causes include Faulty Shifter Lever Assembly, Shifter Lever Assembly harness is open or shorted, Shifter Lever Assembly circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,690

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2104 Chrysler Description

The Front Control Module monitors the Ignition Unlock Run/Start Control Circuit. The Front Control Module will set this Diagnostic Trouble Code (DTC) within 500ms if the ignition unlock run/start circuit voltage is less than the expected value.

OBDII Code B2104 Chrysler - Ignition Unlock Run/Start Control Circuit Low - AutoCodes.com — B2104 Chrysler Code - Ignition Unlock Run/Start Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC B2104 Chrysler?

Faulty Shifter Lever Assembly
Shifter Lever Assembly harness is open or shorted
Shifter Lever Assembly circuit poor electrical connection
Faulty Front Control Module (FCM)

How to Fix the DTC B2104 Chrysler?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2104 Chrysler code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need more information on how to fix the B2104 Chrysler code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2104 Chrysler code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2104 Chrysler Code

1. What are the common symptoms of OBDII code B2104 in a Chrysler vehicle?

The common symptoms of OBDII code B2104 include issues with starting the vehicle, difficulty turning the ignition key, and potential immobilization of the vehicle.

2. What does the OBDII code B2104 Chrysler indicate?

The OBDII code B2104 Chrysler indicates a problem with the Ignition Unlock Run/Start Control Circuit being detected as low, which can affect the vehicle's ability to start properly.

3. What are the possible causes of the Ignition Unlock Run/Start Control Circuit Low code?

Possible causes of the B2104 code in a Chrysler vehicle include a faulty ignition switch, damaged wiring or connectors in the ignition system, or a malfunctioning immobilizer system.

4. How can I diagnose the issue related to OBDII code B2104 in my Chrysler?

Diagnosing the issue related to the B2104 code involves using an OBDII scanner to read the code, checking the ignition system components for any visible damage, and testing the wiring and connectors for continuity.

5. Can I still drive my Chrysler if the B2104 code is present?

If the B2104 code is present in your Chrysler, it is not recommended to drive the vehicle as it may experience starting issues or potentially be immobilized.

6. How can I repair the Ignition Unlock Run/Start Control Circuit Low issue in my Chrysler?

Repairing the B2104 code involves fixing any issues with the ignition switch, repairing or replacing damaged wiring or connectors, and addressing any problems with the immobilizer system.

7. Is it possible to clear the B2104 code on my Chrysler without fixing the underlying issue?

Clearing the B2104 code without fixing the underlying issue may temporarily remove the warning light, but the problem will likely reoccur until the root cause is addressed.

8. Can a DIY enthusiast fix the B2104 code issue in a Chrysler?

While some aspects of diagnosing and repairing the B2104 code can be done by a DIY enthusiast, it is recommended to consult a professional mechanic for a proper diagnosis and repair to ensure safety and effectiveness.

9. How much does it typically cost to repair the Ignition Unlock Run/Start Control Circuit Low issue in a Chrysler?

The cost of repairing the B2104 code in a Chrysler can vary depending on the exact cause of the issue, but it may range from a few hundred dollars to over a thousand dollars, including parts and labor.

10. How can I prevent the OBDII code B2104 from appearing in my Chrysler in the future?

To prevent the B2104 code from appearing in the future, it is important to maintain your vehicle's ignition system, address any electrical issues promptly, and follow the manufacturer's recommended maintenance schedule.